Abstract
A previously unpublished record of lake levels from Lake Naivasha, Kenya from 1880 to 1976 has been analysed and shows little similarity to the level record from nearby Lake Victoria. Level changes from year to year of the two lakes show no significant correlation (at 5%) and spectral analysis of the two records shows no common significant peaks. Both lakes show significant correlations between their level changes and the strength of the North Atlantic winter circulation, with the correlation coefficients in opposing directions indicating important, but different, large scale climatic links.
Lake Naivasha's major level increases occur during May and September. Lake Victoria's level increases mainly in May with a small December increase. East African rainfall is generally during April and November, corresponding with Lake Victoria's changes. Rainfall records from Kenyan highland areas, however, show an August rainfall peak and little rainfall in November. Rainfall amounts from Equator, a highland meteorological station, for July, August and September are highly correlated (at 1% significance level) with the change in Naivasha's level during September. Winds at the highland stations are westerly during August while the lower level stations experience the drier S.E. Trades. The level changes of Lake Naivasha indicate changes in the extent of the penetration of moist air from West Africa between the Trade winds and the 200 mb easterly jet.
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References
Bargman, D. J., Lumb, F. E., and Mörth, H. T.: 1965, ‘Lake levels in East Africa’, in Proceedings of the 1965 Army Conference on Tropical Meteorology, Institute of Marine Science, University of Maimi, Report No. 9, 2–13.
Belmont, A. D., Dartt, D. G., and Nastrom, G. D.: 1974, ‘Periodic variations in the stratospheric zonal wind from 20 to 65 km at 80 °N to 70 °S’, Quart. J. R. Meteorol. Soc. 100, 203–211.
Brooks, C. E. P.: 1923, ‘Variations in the levels of the Central African Lakes, Victoria and Albert’, Geophysical Memoirs, No. 20, London (Meteorological Office).
Butzer, K. W.: 1971, ‘Recent history of an Ethiopian delta’, University of Chicago Geography Department Research Paper 136, 184pp.
Coutts, H. H.: 1969, ‘Rainfall of the Kilimanjaro area’, Weather 24, 66–69.
Davies, R. D., Brimblecombe P., and Vincent, C. E.: 1977, ‘The daily cycle of weather on Mount Kenya’, Weather 32, 406–417.
Flohn, H.: 1960a, ‘Climatic fluctuations and their physical causes, especially in the Tropics’, in Tropical Meteorology in Africa (general editor: D. J. Bargman), Munitalp Foundation, Nairobi, 270–282.
Flohn, H.: 1960b, ‘Equatorial westerlies over Africa, their extension and significance’, in Tropical Meteorology in Africa (general editor: D. J. Bargman), Munitalp Foundation, Nairobi, 253–269.
Griffiths, J. F.: 1972, ‘Eastern Africa’, in World Survey of Climatology Vol. 10 (general editor: H. E. Landsberg), 313–347, Elsevier Publishing Company, Amsterdam.
Hastenrath, S.: 1975, ‘Glacier recession in East Africa’, in Proceedings of the WMO/IAMAP Symposium on Long-Term Climatic Variations, Norwich, 1975, WMO No. 421, Geneva, 133–142.
Johnson, D. H., and Mörth, H. T.: 1960, ‘Forecasting research in East Africa’, in Tropical Meteorology in Africa (general editor: D. J. Bargman), Munitalp Foundation, Nairobi, 56–137.
Kelly, P. M.: 1977a, ‘Volcanic dust veils and North Atlantic climatic change’, Nature 268, 616–617.
Kelly, P. M.: 1977b, ‘Solar influence on North Atlantic mean sea level pressure’, Nature 269, 320–322.
Kidson, J. W.: 1977, ‘African rainfall and its relation to the upper air circulation’, Quart. J. R. Meteorol. Soc. 103, 441–456.
Lamb, H. H.: 1966, ‘Climate in the 1960's’, Geographical Journal 132, 183–212.
Lamb, H. H.: 1970, ‘Volcanic dust in the atmosphere’, Philo. Trans. R. Soc. A266 (No. 1178), 426–533.
Lamb, H. H., and Johnson, A. I.: 1966, ‘Secular variations of the atmospheric circulation since 1750’, Geophysical Memoirs No. 110, London (Meteorological Office).
Leakey, L. B.: 1931, ‘East Africa Lakes’, Geographical Journal 77, 497–514.
Mörth, H. T.: 1967, ‘Investigations into the meteorological aspects of the variations in the level of Lake Victoria’, East African Meteorological Department Memoirs 6, 1–10.
Nieuwold, S.: 1977, Tropical Climatology, Wiley and Sons, London, 207 pp.
Pedgeley, D. E.: 1966, ‘Rainfall of Mt. Kenya’, Weather 21, 187–188.
Sikes, H. L.: 1935, ‘Notes on the hydrology of Lake Naivasha’, Journal of East Africa and Uganda Natural History Society 13, 74–89.
Thompson, B. W., and Mörth, H. T. 1965, ‘Contributing to Notes from East Africa’, No. 1, Weather 20, 226–7.
Thompson, B. W.: 1966, ‘The mean annual rainfall of Mount Kenya’, Weather 21, 48–49.
Western, D., and Van Praet, C.: 1973, ‘Cyclical changes in the Habitat and Climate of an East African Ecosystem’, Nature 241, 104–106.
Wright, P. B.: 1976, ‘An examination of mechanisms involved in the Southern Oscillation’, Unpublished Ph.D. Thesis, University of East Anglia, Norwich, UK.
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Vincent, C.E., Davies, T.D. & Beresford, A.K.C. Recent changes in the level of Lake Naivasha, Kenya, as an indicator of equatorial westerlies over East Africa. Climatic Change 2, 175–189 (1979). https://doi.org/10.1007/BF00133223
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DOI: https://doi.org/10.1007/BF00133223